How were the Pyramids at Giza built?

Encyclopedia of Opinion

Question: How were the Pyramids at Giza built?
Position1 of 4›: The External Ramp Theory

Evidence found at Giza supports the claim that at least some ramps were used. Ramps are commonly found in Egypt supporting other smaller pyramids and monumental structures. There are many variations on this theory. It is the most popular among archaeologists.

Supporting arguments · 3

The Spiral Ramp Theory
A spiraling or winding ramp may have been used to prevent the problems associated with a single long ramp. This would have taken up less space and allowed workers to move up the face of the pyramid with ease. The remains of a small ram at Giza supports this theory.
The Linear Ramp Theory
Ramps are known to have been used at multiple sites across Egypt to build smaller pyramids. A single linear ramp that would have slowly increased in size as the Pyramids were constructed is the simplest explanation available.
The Zigzag Ramp Theory
A zigzagging ramp would fit with the evidence with have from Giza and other sites that ramps were used. Unlike a long ramp model, it would have been compact and allowed for easy access up the face of the Pyramids.